读图，回答

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受丙风的影响，印度（ ）灾害频繁．

阅读下面这首古诗，回答下面两题。
                                                                                                                                            闽中秋思
                                                                                                                                      （唐）杜荀鹤
                                                                                                                      雨匀紫菊丛丛色，风弄红蕉叶叶声。
                                                                                                                      北畔是山南畔海，只堪图画不堪行。

如图所示，斜面AC的高度为h，倾角为θ，一小球从斜面顶端A点水平抛出，恰好落到斜面底端C点．小球运动轨迹上的B点离斜面的距离最大，不计空气阻力．求：